Steel, I do not want to jack this thread and depending on your answer I may just go start a new one. I really want to add an external fuge to my nano....wanted to research if anyone has drilled the back of the nano's, say in chamber 2 or 3 for outflow and then plumb back into the original return somehow. I have no idea if this would even work, and am having crap luck finding ANY threads that really discuss drilling these babies, other than Tigah's inside drilling which I read. I guess my question is have you ran across ANY threads which may discuss what I'm thinking of doing? If I can't find any info I think I'm going to just upgrade to a custom built tank , slightly larger with overflows and drilled for an external (in cabinet) fuge, somthing I can use my same lighting and other equipment on would be my choice, something like 24 deep, 20 high and 20 wide, which is roughly 42 gallons and would be able to use my same lighting, this is pretty mcuh a softie tank, with a few SPS's.
Please let me know if you stumble or stumbled across anything similar, thanks in advance SH.